x÷(x*0.2+3500)≥3.3
    x^2-x>0
    28x x 23（5000-x）小于等于15000
    -1<1+x<1 -1<1-x^2<1 1+x
    (x+2.01)*(x+2.01) >4*[(x/2)*(x/2)+2.39*2.39]
    (x+2.66)*(x+2.66)>4*[(x/2)*(x/2)+2.39*2.39]
    2500m+3000(30－m)≤80000
    3(x-2)<7(x+2)
    (x+1)/3-x/2<1
    x>3
    6/（3-x）>= 0
    35(14-y)+45y>=540
    abs(3*X+2)>=2
    cosx<1/x
    x^(1/x)<1/x
    (-2.47sinx-10)/(20√6 +21.65+21.65cosx)
    2500>((64.95sinx-10)/tan30-21.65+21.65cosx)^2+100
    4900>((64.95sin3x-10)/tan30-21.65+21.65cos3x)^2+100
    3600>((64.95sin3x-10)/tan30-21.65+21.65cos3x)^2+100
    2500>((64.95sin3x-10)/tan30-21.65+21.65cos3x)^2+100

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